Eenst hassenkamp



UNITED STATES J PATENT. OFFIC ERNST HASSENKAMP, OEELBERFELD, GERMANY, "ASSIGN R, BY M SNE ASSIGNMENTS, To EDWARDYN. Io ER oN, JR, OF E YORK, N. Y

' PRODUCTION OF BLUE-RED AZO'DYE-STUFF BY THE ACTION, 0FTETRAZO-DITOLYLLSALTS NIB T -NAPHTHYLAMINE MONO SULPHO-AQID." I

SPE CIFICATIQR forming part of Letters Patent No. 381,132, datedApril 17, 18 88;

Application filed March 1, 1887. Serial No. 229,338. (Specimens) proceed as follows: An aqueous solution of 15 tetrazo ditolyl chloride, formed by diazoti'zing one hundred kilos tolidine sulphate with one hundred kilos muriatic acid and 44.4 kilos of sodium nitrite, is entered intoa solution containing one hundred and eighty kilos of alkylnaphthylamine monosulphoeacid and two hundred kilos of acetate of soda. After heating the mixture and neutralizing with alkali a color is formed which dyes unmordanted cotton a splendid bluish-red, being fast to diluted acid. A brownmed powder, easily-z5 soluble in water, forms the dye-stuff soobtaincd, which differs materially from the yellowish-redcoloring-matter of the benzidine and thebeta-naphthylamine monosulpho-acid, I

With concentrated sulphuric acid the dyeo stuff dissolves into a full blue color.

The formula isas follows:

' Havingthusdescribed myinventiOnQIcIaim 0 I I as new and desire to secure by Letters Patent; V I

The bluish-red coloring-matter-' hereinbefore described, having the qualities specified, i substantially as described. V 1

ERNST HASSENKAMP. Witnesses:

, WM. A. PoLLocK, V

1 H. COUTANT. I r u i 

